Tree ring



FIG. 1 is a top plan view of a tree ring showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a right elevation view thereof;

FIG. 4 is a left elevation view thereof; and,

FIG. 5 is an isometric view thereof.

The broken lines shown in FIGS. 1, 2, and 5 represent perforations and are part of the claimed design. 

The ornamental design for a tree ring, as shown and described. 